Primers fitting loosely in RST shells.

[J.B. Books]

Originally Posted by Cory Rams

I tried both federal and Winchester 209 primers in a couple of spent 2 7/8” RST 10 gauge hulls today. I can push both brands of primers completely flush with my thumb. Any tips or suggestions to get primers to seat with some holding force in RST hulls?

RST uses Cheddite hulls and they most likely get them primed with Cheddite primers. Cheddites can be slightly larger than American made 209 primers. There is a tool you can buy to swage the primer pocket tighter. A trick I have used with undersized 57 primers is to cut a length of plastic straw almost the same length as the narrow part of the primer. Slide it over the primer before seating the primer. The straw should provide enough friction to hold the primer in place. Be careful to not cut the piece of straw too long so that it covers the flash hole as that will most likely lead to a dud.

http://parkerguns.org/forums/showthr...ht=primer+hack